MX 102 - MX110 User Guide
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3.4 Electrical Installation
The electrical supply cables should be connected to the dryer at the dedicated terminals as shown in diagram A7 in Annex A,
using the cable glands provided.
The dryer should be connected to the electrical supply through a switch or circuit breaker rated at 250 VAC, 2 A with a
minimum short circuit rating of 10 KA. This device should be clearly and indelibly marked as the disconnecting device for the
equipment and located in close proximity to the equipment and be easily accessible to the operator.
Overcurrent protection must be fitted as part of the building installation. This protection should be selected in accordance with
local and national code regulations with a maximum short circuit rating of 10 KA.
3.4.1 Remote alarm indication
Each dryer is fitted with a set of volt free relay contacts designed for remote alarm indication and are rated 1 A max
@ 250 Vac (1 A @ 3 0 Vdc).
The alarm circuit should be connected between the "COM" and the normally closed terminals, "N/C" of the relay.
Under normal operation the relay will be energised and the alarm circuit will be open. When a fault occurs, e.g.
power failure, the relay will de-energise causing the alarm circuit to be complete.
The external alarm circuit should be connected to the dryer at the dedicated terminals as shown in diagram A8 in
Annex A. using the cable glands provided.
3.4.2 MXS-DS Hygrometer connection
The MXS - DS dryer operates on a variable cycle time controlled via a dewpoint dependent switching energy
management system. The hygrometer should be connected to the dryer at the dedicated terminals as shown in
diagram A9 in Annex A, using the cable glands provided.
3.4.3 MXA Analogue Outputs
The MXA dryer includes two sets of 4 - 20 mA linear analogue outputs, which are used for the optional re-
transmission of the pressure and dewpoint readings. Connection to the outputs should be made at the dedicated
terminals shown in diagram A10 in Annex A, using the cable glands provided.
More detailed information is available in the MXA advanced controller addendum (dh Stock No: 178620002)
A fully qualified electrical engineer must undertake all electrical work in accordance with local regulations.
The dryer must be bonded to earth at the terminal marked with the international symbol IEC-60417 - 5017.
If the remote alarm indication relay is used, the electrical enclosure will contain more than one live circuit. The
relay connections will remain live when the mains supply is disconnected.
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